Level with rotating vial and locking assembly

ABSTRACT

A level including a rotating level vial is provided. The level includes a locking mechanism that utilizes an actuator that engages a brake to lock the rotating vial into the desired position. The locking mechanism may include a spring element that is compressed by the actuator during locking, and the spring element in turn pushes against the brake facilitating control of the normal force that the brake applies to the vial surround of the rotating vial. The rotating level vial may engage the level body such that the rotating level vial is permitted to rotate 360 degrees in both the clockwise and counter clockwise directions.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

The present application is a continuation of U.S. application Ser. No.16/700,623, now U.S. Pat. No. 11,085,764, filed Dec. 2, 2019, which is acontinuation of U.S. application Ser. No. 15/365,508, now U.S. Pat. No.10,527,415, filed Nov. 30, 2016, which is a continuation ofInternational Application No. PCT/US2016/064175, filed Nov. 30, 2016,which claims the benefit of and priority to U.S. Provisional ApplicationNo. 62/265,545, filed on Dec. 10, 2015, which are incorporated herein byreference in their entireties.

BACKGROUND OF THE INVENTION

The present invention relates generally to the field of tools. Thepresent invention relates specifically to a tool, such as a level, witha rotating vial and a locking assembly configured to temporarily,reversibly and/or selectably fix the vial in place at a custom angle asselected by a user. Levels are used to determine the levelness of astructure, surface or workpiece. In use the level is placed on or incontact with a surface to be measured, and the user views the locationof a bubble within a vial relative to markings that indicate thelevelness of the structure, surface or workpiece.

SUMMARY OF THE INVENTION

One embodiment of the disclosure relates to a tool, specifically alevel. The level includes a level body defining a base surfaceconfigured to engage a workpiece and a rotating level vial locatedwithin the level body. The rotating level vial has an interior chambercontaining a mineral spirit liquid and a bubble. The level includes avial support surrounding and supporting the rotating level vial, and thevial support is located within an opening formed in the level body. Thevial support is rotatable within the opening such that the rotatinglevel vial may be oriented at a plurality of angular positions relativeto the base surface. The level includes a locking system including athreaded channel, a threaded screw engaging the threaded channel and abrake component having a first surface facing the vial support and asecond surface facing the threaded screw. The threaded screw is moveablewithin the threaded channel between a locked position and an unlockedposition. In the locked position, the threaded screw engages the brakecomponent such that the first surface of the brake component engages thevial support with a force sufficient to restrain rotation of the vialsupport and to hold the rotating level vial and vial support in aselected angular position relative to the base surface. In the unlockedposition, the vial support and rotating level vial are permitted torotate within the opening.

Another embodiment of the disclosure relates to a level. The levelincludes a level body defining a base surface configured to engage aworkpiece and a level vial located within the level body. The levelincludes a vial support surrounding and supporting the level vial, andthe vial support is located within an opening formed in the level body.The vial support is rotatable within the opening such that the levelvial may be oriented to a plurality of angular positions relative to thebase surface. The level includes a locking system. The locking systemincludes an actuator and a brake component having a first surface facingthe vial support and a second surface facing the actuator. The lockingsystem includes a spring element located between the actuator and thebrake such that the actuator compresses the spring element when theactuator is moved from an unlocked position to a locked position inwhich the actuator causes the first surface of the brake component toengage the vial support with a force sufficient to restrain rotation ofthe vial support.

Another embodiment of the disclosure relates to a leveling device. Theleveling device includes a level body defining a base surface configuredto engage a workpiece and a level vial located within the level body.The leveling device includes a vial support surrounding and supportingthe level vial. The vial support is located within an opening formed inthe level body, and the vial support is rotatable within the opening 360degrees in both the clockwise and counterclockwise directions such thatthe level vial may be oriented a plurality of angular positions relativeto the base surface. The level includes a locking system configured tolock the vial support in a selected angular position.

BRIEF DESCRIPTION OF THE DRAWINGS

This application will become more fully understood from the followingdetailed description, taken in conjunction with the accompanyingfigures, wherein like reference numerals refer to like elements inwhich:

FIG. 1 is a perspective view from above of a level according to anexemplary embodiment.

FIG. 2 is an exploded perspective view showing a locking assembly for arotating level vial according to an exemplary embodiment.

FIG. 3 is a perspective cross-sectional view of the locking assembly ofFIG. 2 according to an exemplary embodiment.

FIG. 4 is a side cross-sectional view of the locking assembly of FIG. 2according to an exemplary embodiment.

FIG. 5 is a perspective view from below of the level of FIG. 1 accordingto an exemplary embodiment.

FIG. 6 is a perspective view from below of a level according to anotherexemplary embodiment.

FIG. 7 is an exploded perspective view of a locking assembly of thelevel shown in FIG. 6 according to an exemplary embodiment.

DETAILED DESCRIPTION

Referring generally to the figures, various embodiments of a level areshown. In general, the levels discussed herein include one or more levelvial and a level base. As will be generally understood, the base surfaceof the level is placed on a workpiece (e.g., a structure, surface, etc.)in order for the user of the level to determine the levelness of theworkpiece surface. The level embodiments discussed herein include one ormore rotating vials and a locking mechanism used to temporarily,reversibly and/or selectably fix the rotating vial at a custom anglerelative to the level base as may be selected by the level user.

Traditionally, levels include one or more vials preset at specificangles relative to the level base, such as 0, 90, and/or 45 degrees.However, these standard, fixed and preset angles may be difficult to useduring some types of work where repeated leveling of surfaces atnonstandard angles is common. The rotating vial of the presentdisclosure allows the user to select the angle of the level vialrelative to the level base. Thus, the user can utilize a single levelwhich can be adapted by the user to a task requiring leveling ofsurfaces located at a non-standard angle (e.g., measure levelness ofsurfaces at non-standard angles).

However, a challenge with a rotating level vials is how to secure thevial in place at the angle selected by the user. The level embodimentsdiscussed herein include a locking assembly that Applicant hasidentified as providing superior locking performance (at least comparedto some conventional level designs). In particular, the locking assemblydiscussed herein reversibly locks the rotating vial in place in a mannerthat reliably holds the vial in the desired rotational position whilereducing/eliminating the chance that the rotating vial inadvertentlyrotates (e.g., rotates in a pocket, in a tool belt, while being carried,while being used, etc.). As discussed below, in various embodiments, thelocking mechanism discussed herein securely fixes the rotating vialwithin the housing of the level until the locking mechanism isdisengaged intentionally by the user. In addition, the rotating vialdesign discussed herein allows the level vial to be rotated 360 degreesin both the clockwise and counterclockwise directions.

Referring to FIG. 1 , a level with a rotating vial, such as level 20, isshown according to an exemplary embodiment. Level 20 includes a levelbody, shown as housing 22, and a base surface, shown as level base 23. Afirst vial 24 is set in housing 22 such that it is parallel or at 0degrees relative to level base 23. A second vial 26 is set in housing 22such that it is perpendicular to or at 90 degrees relative to level base23.

Level 20 includes a rotating level vial assembly 25 and includes a vialsupport, shown as vial surround 30, and a level vial 28. Vial surround30 is set in housing 22 such that it may rotate freely within housing22. Vial 28 is fixed in vial surround 30 such that it may be rotatedalong with vial surround 30 to form a variety of selected anglesrelative to level base 23. As shown, vial 28 is rigidly fixed inposition relative to vial surround 30 such that rotation of vialsurround 30 cause rotation of vial 28. In general, vials 24, 26 and 28are hollow vials (e.g., glass or plastic vials) having an internalchamber holding a liquid, such as a mineral spirit, and including abubble which moves providing the leveling indication.

In one embodiment, vial surround 30 is rotatable 360 degrees withinhousing 22. In some such embodiments, vial surround 30 is rotatablecontinuously such that vial surround 30 and vial 28 may be positioned atan angular position selected by the user. In various embodiments, vialsurround 30 and vial 28 are rotatable in both the clockwise and counterclockwise directions as shown by arrow 27. In other embodiments, vialsurround 30 only rotates a limited number of degrees within housing 22(e.g., rotatable less than 360 degrees, less 270 degrees, less than orequal to 180 degrees, etc.).

Referring to FIGS. 1 and 2 , a locking system or assembly, shown aslocking mechanism 32, is set in a cavity 31 of housing 22. Lockingmechanism 32 includes an actuator, shown as adjustable fastener 34, thatapplies a variable coupling force on vial surround 30 to reversibly andselectably fix vial surround 30 at a desired angle relative to levelbase 23. Fastener 34 may be disengaged such that low or zero couplingforce is applied to vial surround 30 allowing vial surround 30 to rotatewithin housing 22. Various embodiments include various combinations ofpreset and rotatable vials, including embodiments with one or morerotating vial, only a single rotatable vial and no fixed vials andembodiments with multiple rotatable vials having separate lockingmechanisms and no fixed vials.

Referring to FIG. 2 , an exploded view of an embodiment of lockingmechanism 32 is shown removed from cavity 31. Locking mechanism 32includes adjustable fastener 34, an insert 36, a retainer 38, and pad40. Insert 36 is fixed at the entrance of cavity 31 and configured toreceive fastener 34. In one embodiment, an adhesive is used to fixinsert 36 within cavity 31, and in another embodiment, insert 36 isfriction fit within cavity 31. Retainer 38 and a brake, shown as pad 40,are placed within cavity 31 behind insert 36 and sized such that theyare movable in the longitudinal direction within cavity 31.

In this arrangement, pad 40 has a first or inner surface facing vialsurround 30 and a second or outer surface facing adjustable fastener 34.In one embodiment a biasing element or spring element, shown as spring39, is located between retainer 38 and pad 40. In one embodiment, spring39 is a coil spring, and in another embodiment spring 39 is a washerspring. In various embodiments, the locking assembly may include a widevariety of biasing elements, such as a helical coil spring, a leafspring, v-spring, Belleville spring, various types of elastic materialsincluding rubbers, foams, etc.

Referring now to FIG. 3 , a perspective cross-sectional view of anembodiment of the locking mechanism 32 and vial surround 30 within level20 is shown. In this embodiment, fastener 34 is a screw having a head 41and body or shaft 43, and the body has threads 35. Insert 36 hascooperating threads 37 that engage threads 35 such that fastener 34 maybe advanced into and out of cavity 31 by rotating fastener 34. In thisembodiment, insert 36 defines a threaded internal channel within whichfastener 34 is received, but in other embodiments, threads 37 may beformed directly in the material of level body 22.

In general, and as will be explained in more detail below, fastener 34is moveable within insert 36 between a locked position and an unlockedposition. In general, in the locked position, the inner surface of pad40 is moved to engage the outer surface of vial surround 30 with a forcesufficient to restrain rotation of vial surround 30 and to hold levelvial 28 and vial surround 30 in a selected angular position relative tothe base 23. In general, in the unlocked position, vial surround 30 andlevel vial 28 are permitted to rotate within level body 22.

The body of fastener 34 is longer than insert 36 such that a portion ofthe body of fastener 34 extends into cavity 31 beyond the inner end ofinsert 36 when fastener 34 is partially or fully advanced within cavity31. A depression 42 is included on the top of retainer 38. Depression 42is configured to receive the portion of fastener 34 that extends beyondthe end of insert 36. In an alternative embodiment, the depression 42 isomitted, and retainer 38 is flat across the surface facing fastener 34.

As shown in FIG. 3 , the inner end of retainer 38 includes a reduceddiameter post 44, and the outer end of pad 40 facing retainer 38includes a reduced post 46. As shown in FIG. 3 , posts 44 and 46 extendinto the central cavity of spring 39, and in this manner posts 44 helpretain spring 39 in the appropriate position during locking andunlocking of locking mechanism 32.

In general, the compression state of spring 39 corresponds to theadvancement of fastener 34 within cavity 31. When fastener 34 is fullyremoved from cavity 31, spring 39 is in its uncompressed state, and whenfastener 34 is fully advanced within cavity 31 spring 39 is in its fullycompressed state (see FIG. 4 ). In other embodiments, fastener 34 neednot be fully removed from cavity 31 to induce the uncompressed staticstate in spring 39. In some embodiments, fastener 34 is sized such that,upon retraction, no portion of fastener 34 extends into cavity 31 beyondthe inner end of insert 36 resulting in the uncompressed state of spring39.

In one embodiment, one face of retainer 38 is in contact with theopposing face of insert 36 when spring 39 is in its uncompressed staticstate. In one embodiment, pad 40 includes a face 48 in contact with asurface 50 of vial surround 30 when spring 39 is in both theuncompressed state and fully compressed state. The constant contact ofpad 40 with surface 50 provided by spring 39 ensures a minimum amount offriction between the surface 50 and pad 40 regardless of the position offastener 34. In one embodiment, the minimum friction is such that vialsurround 30 will not freely rotate, but can be moved by applying aslight force, such as a gentle twist. Disabling free rotation of vialsurround 30 when the spring 39 is in its uncompressed static stateallows the vial 28 to remain set but not locked with respect to levelbase 23 as the locking mechanism 32 is engaged.

To allow the vial to be rotated and positioned at the desired angularposition by the user, fastener 34 is advanced out of cavity 31, bringingspring 39 to its uncompressed state, which in turn decreases the normalforce applied by pad 40 onto the outer surface of vial surround 30. Inone embodiment, when fastener 34 is fully withdrawn, no portion extendsinto cavity 31 beyond the interior end of insert 36. In the unlockedstate, no normal force or a relatively small normal force is applied tovial surround 30 by pad 40, which allows vial surround 30 to rotatewithin level body 22 to the desired angle. In one embodiment, vialsurround 30 includes an indicator that corresponds to markings onhousing 22 that indicate the current angle of vial 28.

To lock vial surround 30 in place, fastener 34 is advanced into cavity31. As fastener 34 advances it contacts depression 42 of retainer 38.The further advancement of fastener 34 advances retainer 38 further intocavity 31. The advancement of retainer 38 engages the first end ofspring 39 and begins to compress the spring 39. As spring 39 iscompressed, the second end of spring 39 pushes pad 40 against surface 50with a greater force. This action increases the amount of frictionbetween surface 50 and face 48. This process will continue untilfastener 34 is fully within cavity 31 and/or the spring 39 is in itsfully compressed state, at which point vial surround 30 will be fullylocked in place such that rotational movement of vial surround 30 willbe prevented or resisted.

In such embodiments, the normal force between surface 50 and vialsurround 30 is related to the degree to which fastener 34 is threadedinto insert 36 and to the amount of compression of spring 39, and inspecific embodiments, the normal force between surface 50 and vialsurround 30 increases as the degree of spring compression increasesand/or as fastener 34 is threaded further into insert 36. Thus, in sucharrangements, utilizing a biasing element, such as spring 39, as part oflocking mechanism 32 allows locking mechanism 32 to provide varyinglevels of normal force onto vial surround from a low or zero amount ofnormal force to a high amount of normal force when spring 39 is fullycompressed.

Referring to FIG. 4 the locking mechanism 32 is shown in its fullylocked or engaged position with the top of pad 40 contacting the bottomof retainer 38. In this embodiment spring 39 (labeled in FIG. 3 ) isfully compressed and located between pad 40 and retainer 38 and is shownsurrounding first and second posts 44 and 46. In alternativeembodiments, the biasing element may fill the space between pad 40 andretainer 38 thus preventing contact of the top of pad 40 and bottom ofretainer 38. In one embodiment, the portion of cavity 31 is sealed offby use of standard O-rings around the exterior surfaces of pad 40 andretainer 38.

In another embodiment, a first slot is included on the end of retainer38 facing pad 40 that is configured to receive a first end of a biasingelement, such as spring 39. In addition, a second slot is included onthe end of pad 40 facing retainer 38 that is configured to receive asecond end of the biasing element, such as spring 39. In suchembodiments, spring 39 is located between retainer 38 and pad 40 withinan area defined by the opposing slots of retainer 38 and pad 40.

In various embodiments, Applicant has developed a rotating level andlocking mechanism that is positioned relative to level body 22 and/orbase 23 in a manner that improves use/access to locking mechanism 32 andthat may facilitate assembly of locking mechanism 32. In particular,Applicant believes that the arrangement discussed herein provides alocking mechanism having low complexity that also provides a tight holdon vial surround 30 when in the locked position.

Referring back to FIG. 1 , level body 22 defines a longitudinal axis 52,and vial surround 30 is positioned so that its axis of rotation issubstantially perpendicular (e.g., within 1 degree of perpendicular) tolongitudinal axis 52 and substantially parallel (e.g., within 1 degreeof parallel) to the plane defined by base surface 23. In addition, ascan be seen in FIGS. 1 and 2 , a longitudinal axis defined by thethreaded channel of insert 36 is substantially parallel (e.g., within 1degree of parallel) to longitudinal axis 52.

Still referring to FIGS. 1 and 2 , longitudinal axis 52 extends from afront end 54 to a rear end surface 56 of level body 22, and the threadedchannel of insert 36 includes an open end that is accessible throughrear end surface 56 such that fastener 34 can be received within thethreaded channel through rear end surface 56. In this arrangement, therotating vial surround 30 and vial 28 are located between end surface 56and central vial 24.

Referring to FIG. 1 , fastener 34 is sized and positioned relative tolevel body 22 to both provide convenient access to and manipulation offastener 34, without providing a protrusion that might otherwise causesnags, break easily, etc. Thus, as shown in FIG. 1 , screw head 41 offastener 34 includes a sidewall 58 and an endwall 60. Fastener 34 issized such that endwall 60 is recessed inward in the direction oflongitudinal axis 52 relative to rear end surface 56, thus ensuring,fastener 34 (at least in the locked position) does not extend past orprotrude from end surface 56. In addition, sidewall 58 is textured,patterned, embossed, raised, etc. to provide a gripping surface thatallows the user to easily spin fastener 34 during locking and unlocking.

Referring to FIG. 5 , a perspective view from below of level 20 isshown. In various embodiments, base 23 may include a groove or channel70 extending in the direction of longitudinal axis 52 along base 23. Insuch embodiments, channel 70 allows level 20 to engage an elongate,narrow workpiece, such as conduit. In addition, in some embodiments,level 20 includes one or more magnetic coupling element 72 located alongbase 23. In such embodiments, the magnetic coupling element(s) 72facilitate use of level 20 with magnetic workpieces, such as metalconduit, by allowing level 20 to be coupled to the magnetic workpiecevia the magnetic attraction provided by magnetic coupling element(s) 72.

Referring to FIGS. 6 and 7 , a level 100 is shown according to anexemplary embodiment. In general, level 100 is substantially the same aslevel 20, except that level 100 includes a small level body 102. Invarious embodiments, level body 102 is sized to fit easily in a pocket,hand, drawer, etc., and level body 102 has a length in the direction oflongitudinal axis 52 that is less than the length of level body 22. Insuch embodiments, level body 102 defines a small, short base 104. Invarious embodiments, the length of body 102 and of base 104 in thedirection of longitudinal axis is less than 12 inches, less than 8inches, less than 6 inches or less than 4 inches.

As shown, level 100 includes a rotating level vial assembly 25 and alocking system 32. In contrast to level 20, rotating level vial assembly25, and in particular vial surround 30, is relatively large compared tolevel body 102. In various embodiments, the maximum outer diameter ofvial surround 30 is at least 10% and less than 80% and specifically, atleast 25% and less than 75% of the length of body 102.

In various embodiments, locking mechanism 32 may be used with variousstyles of levels, including block torpedo style level, billet torpedotype level, box levels, I-beam style levels, etc. In variousembodiments, level body 22 may be formed from die cast metal such asaluminum, and in other embodiments, level body 22 may be formed from anextruded metal material (e.g., extruded aluminum). In some specificembodiments, base surface 23 is machined to have a flat, flush or planarsurface following extrusion, and in some embodiments, this machinedsurfaced may be anodized.

It should be understood that the figures illustrate the exemplaryembodiments in detail, and it should be understood that the presentapplication is not limited to the details or methodology set forth inthe description or illustrated in the figures. It should also beunderstood that the terminology is for the purpose of description onlyand should not be regarded as limiting.

Further modifications and alternative embodiments of various aspects ofthe invention will be apparent to those skilled in the art in view ofthis description. Accordingly, this description is to be construed asillustrative only. The construction and arrangements, shown in thevarious exemplary embodiments, are illustrative only. Although only afew embodiments have been described in detail in this disclosure, manymodifications are possible (e.g., variations in sizes, dimensions,structures, shapes and proportions of the various elements, values ofparameters, mounting arrangements, use of materials, colors,orientations, etc.) without materially departing from the novelteachings and advantages of the subject matter described herein. Someelements shown as integrally formed may be constructed of multiple partsor elements, the position of elements may be reversed or otherwisevaried, and the nature or number of discrete elements or positions maybe altered or varied. The order or sequence of any process, logicalalgorithm, or method steps may be varied or re-sequenced according toalternative embodiments. Other substitutions, modifications, changes andomissions may also be made in the design, operating conditions andarrangement of the various exemplary embodiments without departing fromthe scope of the present invention.

What is claimed is:
 1. A level comprising: a level body defining a basesurface, the level body including: a front end surface; a rear endsurface; and a longitudinal axis extending between the front end surfaceand the rear end surface defining a length of the level body; a levelvial located within the level body; a vial surround supporting the levelvial, the vial surround located within an opening formed in the levelbody, wherein the vial surround includes an outer diameter; and alocking system comprising: a fastener; and an insert having a threadedchannel parallel to the longitudinal axis, wherein the threaded channelincludes an open end extending through the rear end surface such thatthe fastener is received within the threaded channel.
 2. The level ofclaim 1, wherein the outer diameter of the vial surround is at least 25%and less than 75% of the length of the level body.
 3. The level of claim2, wherein the length of the level body is less than 12 inches.
 4. Thelevel of claim 1, wherein the vial surround has an axis of rotation andis positioned such that the axis of rotation is perpendicular to thelongitudinal axis and parallel to a plane defined by the base surface.5. The level of claim 4, wherein the vial surround is rotatable withinthe opening 360 degrees in both the clockwise and counterclockwisedirections.
 6. The level of claim 1, wherein the base surface includes achannel extending in a direction of the longitudinal axis such that thebase surface is configured to engage a workpiece.
 7. The level of claim1, wherein the level further includes one or more magnetic couplingcomponents positioned along the base surface.
 8. A level comprising: alevel body defining a base surface; a level vial assembly comprising: arotating level vial; and a vial surround supporting the rotating levelvial, the vial surround located within an opening formed in the levelbody and wherein the vial surround is freely rotatable within theopening; and a locking mechanism, set within a cavity of the level body,comprising: an actuator; an insert, to receive the actuator; a retainerand a pad both located within the cavity behind the insert; and a springelement located between the retainer and the pad; wherein, when thelocking mechanism is in a locked position the spring element is in acompressed state and, when the locking mechanism is in an unlockedposition, the spring element is in a uncompressed state wherein the padincludes a face in contact with a surface of the vial surround when thespring element is in both the compressed state and in the uncompressedstate to provide a constant contact of the pad with the surface of thevial surround; wherein the constant contact creates a minimum frictionbetween the surface of the vial surround and the pad.
 9. The level ofclaim 8, wherein the minimum friction prevents the vial surround fromfreely rotating when the spring element is in the uncompressed state,such that the level vial is set in the unlocked position with respect tothe base surface.
 10. The level of claim 8, wherein the actuatorprovides a variable coupling force on the vial surround such that therotatable level vial may be oriented and selectably fixed at a pluralityof angular positions relative to the base surface.
 11. The level ofclaim 8, wherein the rotating level vial is the only rotatable levelvial supported by the level body.
 12. The level of claim 11, furtherincluding: a first fixed level vial positioned in the level body suchthat the first fixed level vial is parallel to the base surface; and asecond fixed level vial positioned in the level body such that thesecond fixed level vial is perpendicular to the base surface.
 13. Thelevel of claim 12, further including a longitudinal axis extendingbetween a front end and a rear end surface of the level body, whereinthe vial surround and rotatable level vial are positioned between therear end surface and the first fixed level vial.
 14. The level of claim8, wherein an adhesive is used to fix the insert within the cavity ofthe level body.
 15. A level comprising: a level body defining a basesurface and a longitudinal axis extending between a front end and a rearend surface of the level body; a rotating level vial; a vial surroundsupporting the rotating level vial, the vial surround located within anopening formed in the level body, wherein the vial surround is freelyrotatable within the opening such that the rotating level vial may beoriented at a plurality of angular positions relative to the basesurface; and a locking system, set within a cavity of the level body,comprising: a fastener providing a variable coupling force on the vialsurround; an insert, fixed at an entrance of the cavity, to receive thefastener, wherein the insert is substantially parallel to thelongitudinal axis; a retainer including an outer diameter; a padincluding an outer diameter; and a spring element between the retainerand the pad; wherein the outer diameters of the retainer and pad areless than an inner diameter of the cavity such that both the retainerand pad are sized to fit within the cavity behind the insert andmoveable in a longitudinal direction within the cavity; wherein, whenthe locking system is in an engaged position the spring element is in acompressed state and, when the locking system is in an disengagedposition, the spring element is in a uncompressed state.
 16. The levelof claim 15, wherein the pad includes a face in contact with a surfaceof the vial surround when the spring element is in both the compressedstate and in the uncompressed state to provide a constant contact of thepad with the surface of the vial surround and wherein the constantcontact creates a minimum friction between the surface of the vialsurround and the pad regardless of a position of the fastener.
 17. Thelevel of claim 15, the retainer including a post extending within thespring element in the longitudinal direction, the post having a reduceddiameter relative to the outer diameter of the retainer.
 18. The levelof claim 15, the pad including a post extending within the springelement in the longitudinal direction, the post having a reduceddiameter relative to the outer diameter of the pad.
 19. The level ofclaim 15, wherein the fastener is a threaded screw having a head thatincludes a sidewall and an endwall, the endwall recessed inward alongthe longitudinal axis relative to the rear end surface.
 20. The level ofclaim 19, wherein the sidewall includes a gripping surface such that auser can easily spin the fastener to engage and disengage the lockingsystem.